Method of making unions and the like.



H. G. CARLSON.

METHOD OF MAKING UNIONS AND THE LIKE.

APPLICATION FILED DEC. 3. 1914.

1 142 303 Patented J uhe 8, 1915.

Ac/ SWWM.

UNITED {STATES PATENT onnron.

Human 11. cAmsoN, or woncnsrnn, a):assacism'sn'nrs, assmivon: r0 mmweon SPRINKLER .COMPANKQEMASSAOHUSETTSfA CORPORATION oFMAssAcHIIsE'Ms.

I mzrno'n: ormxme UNIONS nmr'mn BIKE.

ratenteaiJun afleis.

-' Application mcd 'necem'ber 3, 1814. Serial No. 875,856.

To all whom it may-concern.

Be itlmown that I, HJALMAR'G-OAImsoN, a citizen of the United States, residing --at Worcester, 1 in the county of Worcester and State of Massachusetts, have inventeda new and useful P'Method of Making= Unions and in a minimum number of operationsyand more specifically toprovide an eiiicient method of forcing a portion of the sheet metal outwardly in the dies for the purpose of providing a projecting end and a surface at the end of the article suitable for abutting against a complementary surface and forming a tight joint therewith.

Reference is to be had to the accompanying drawings, in which Figure 1 is'a central longitudinal sectional view of a cup-shaped blank showing one step of the operation; Fig. 2 is a similar view showing the next step; Fig. 3 is a central vertical sectional view, of a set of dies for operating on the blank shown in Fig. 2; and Fig. 4 is a. longitudinal central sectional view of a complete union comprising a member formed by this method.

In the manufacture of a member of a pipe union or othersimilar article according to this invention, a circular disk of sheet metal is the original blank which is employed.

This disk is first formed by ordinary wellknown die pressing operations into the cupshaped blank a indicated in Fig. 1. In this figure the sheet metal blank f has been shaped in simple dies to form a cylindrical portion and a flat end 72. with rounded edges.-

These are formed by a well known die pressing operation from a circular disk of sheet metal. The next operation in forming this member is to punch out the entire end 7 to leave aJperforation y, as indicated in Fig. 2. This blank is then placed in a set of dies shown in Fig. 3 and comprising a bottom plate 25 having an ejector 26 extending up through it and provided with a central replunge cessa26'. An intermediatediemember 27 has :a central ;cylindrical passage therethrough ofithe-samesize-as the cylindrical blank: f. *A top die"memherz28;hasa concave surface-28"x for shaping the; top of the blank and iiS :g-provided with a" central removable r 29 fixed in position by -a-screw 30 or the like. :Theexterior of thisplunger has aidiameter substantially-the same as the internal diameter of -the--original blank f. The upper .die 28 with its .plunger 29 is brought down on the: blank and this results in forcing the metal of the end downwardly. Assthe bottom ofthe'blank already rests on the top of: the head of'the ejector 26 and as the plunger 29 is already within the blank was to support its walls-internally; the only fresult'of forcing this metal down is to force it outwardly into the cavity 28', thus enlarging the end of the blank to form the male enlargement f (Fig. 4). It is'found in practice that this results in causing the metal to move away from the plunger 29 and to form a circular cavity 7' surrounding the same which does not weaken the union. This operation having been accomplished, the blank is removed, threaded and machined if necessary, although as a matter of fact it is found that no machining is re quired especially when brass is used, but when made of iron or steel'the convex bearing surface of the enlargement f is finished and the end is usually squared up.

It is to be observed that the member F, although formed by a very simple series of operations, is provided with a slight enlargement andsquare shoulder f for the flange of the nut G and is providedwith a convex end surface suitable for fitting against the concave end surface'of the female member A. The dies by which these operations are performed are simple and complete in themselves and they are easily manufactured and operated.

Although I have illustrated the invention as applied tothe manufacture of a part of a I pipe union, I am aware of the fact that the principles thereof can be carried out in substantially the same way in the manufacture of other articles of a somewhat similar form and that the exact sequence of operations can be changed to some extent without departing from the scope of expressed in the clalms. Therefore, I do the invention as not wish to be limited to the manufactur f '110 I.

this "specific article or to the exact order of steps or shape of dies herein shown and described but What I do claim is 11A method ofmaking a member of a pipe union from sheet metal which consists in forming a disk shaped sheet metal blank into, a cup-shaped form, perforating t end thereof, orcing a plunger .a'xially into the blank through the perforation, and simultaneously forcing the blank longitudinally in. a set of dies and compressing it to form the open end thereof into a cylindrical sha e surrounding said plunger and the per 0- ratedend into a larger formin contact with the' plunger at the bottom and top thereof.

2:. A method of making a member of a o v pipe union from sheet metal which ,consists in providing a cup-shaped blank having an open "end, punching out the entire opposite end thereof, introducing a plunger of the size of said opening into the interior ofthe cylindrical blank, holding the exterior of the open end of the blank in its original shape and compressing the edge of the opposite end around said plunger to increase its diameter, decrease its length, and keep its outer edge in contact with the plunger.

3. A method of making a member of a pipe union which consists in forming a cylindrical blank with both ends open and the l corner of one end rounded over, introducing said blank into a set of dies having a passage therein of substantially the same' size as the exterior diameter of the blank, placing a plunger of the same external diameter as the interior of the blank into the blank witnesses. V

HJALMAR G. OARLSON. -Witnesses: v

GEORGE A. PRATT, DONALD W. ORMSBEE. 

